""More than a year ago The Australian Financial Review's political editor, Laura Tingle, wrote that there were ''two possible explanations'' for the opposition ending up with an $11 billion hole in the cost of their election commitments: ''One is that they are liars, the other is that they are clunkheads.'' She went on: ''Actually, there is a third explanation: they are liars and clunkheads. But whatever the combination, they are not fit to govern.''"